Numbers provided a huge amount of inspiration this week, so much so that I began to think that numbers – and sequences of numbers – must be second only to love as the pefect subject for a song. Strictness was the issue here; I have tried to make the A-list as properly about numbers – and only numbers – as I could, but, hey, this is entertainment, so I may have cracked once or twice. Three times at the most.

As for the B-list, that starts with DJ Shadow's countdown spectacular,The Number Song, then moves on to Shellac's lurching New Number Order before soothing its troubles with Portishead's Revenge of the Number.

The Decemberists 16 Military Wives is built on the relationships between people and numbers, while Johnny Cash's version of Glenn Danzig's Thirteen considers the ways in which we give power and significance to certain numbers. Souls of Mischief's 93 'til Infinity gave enormous significance to that year, so convinced were the Oakland, CA band that they would be "chilling" for ever after. In fact, they were dropped in 1995, but the track remains fantastically powerful 16 years later. John Renbourn's instrumental, Forty Eight, is his take on a traditional English folk tune, while Captain Beefheart & the Magic Band's Her Eyes Are a Blue Million Miles is a wonderfully lyrical use of a number conveying almost unimaginable depth and beauty.

Finally, we've got De La Soul's Area, which is built around the obsessive observance of post codes (or zip codes, if you prefer) and we finish with Blondie's Detroit 442, a hymn to the number given to the Oldsmobile muscle car. Oh yes.

This week I'm after songs about fictional places. These places may have already appeared in other people's works of fiction, or they could be entirely new inventions, but they must be the product of someone's imagination. Fantastical, deadly, sacred, profane, metallic, snow-bound, ludicrous – it's in your hands. Special attention may be given to places that sound so amazing you end up feeling a bit miserable they don't actually exist. There's a collaborative Spotify playlist here.

Deadline is midday Monday; please note that posts should not contain more than a third of a song's lyrics. The A-Z and RR archive are buying new hiking boots, while the Overspill blog has been busy laminating its passport. Where shall we go now then?